Elevator



(No Model.) 4 Sheets-Sheet 1.

J. A. DEAN. ELEVATOR.

No; 511,727. Patented Dec. 26,1893.

(No Model.) 4 Sheets-Sheet 2.

J; A r DEAN. ELEVATOR. No. 511,727. Patented Dec. 26, 1893.

Ilium HIIII-I IIIIIIIIIIUIH (No Model.) 4 Sheets-Sheet 3 -J. A. DEAN.ELEVATOR.

No. 511,727. Patented Dec. 26. 1893.

(No Model.) 4 sheets sh'eet 4;

J. A. DEAN.

ELEVATOR.

o. 511,727. Patented Dec. 26, 1893.

JOHN A. DEAN, OF \VOROESTER, MASSACHUSETTS.

ELEVATOR.

SPECIFICATION forming part of Letters Patent No. 511,727, dated December26,1893.

Application filed October 23, 1391. Serial No. 409,578. (No model.)

To all whom, it. may concern:

Be it known that I, JOHN A. DEAN, a citizen of the United States,residing at Worcester, in the county of Worcester and State ofMassachusetts, have invented certain new and useful Improvements inElevators, of which the following is a specification, reference beinghad to the accompanying drawings, forming a part of the specification,and representing the hoisting mechanism of an elevator.

Figure 1, denotes a top view of a hoisting mechanism embodying myinvention; Fig. 2, is an end view of the same. Fig. 3, is a sectionalview on line X, X, Fig. 1. Fig. 4, is a central horizontal sectionalview on line Y, Y, Fig. 2. Fig. 5, represents an end view of the windingdrum. Fig. 6, is a plan view of the end of the winding drum shown inFig. 5. Fig. 7, is an end view of the driving gear showing the sideengaging the winding drum and Fig. 8, is a central sectional view of thedriving gear.

Similar letters refer to similar parts in the.

difierent figures.

My invention relates to that class of elevators sometimes known as powerelevators and in which power is applied to raise the load through ahoisting mechanism, and my invention relates particularly to certainimprovements in the hoisting mechanism, by which I secure compactnessand simplicity of construction and greater certainty and efficiency ofoperation and these ends are accomplished by means of the constructionand arrangement of the hoisting mechanism as hereinafter described andspecifically set forth in the annexed claims.

Referring to the drawings A, A, denotes the supporting frame-work uponwhich the main shaft B is journaled. Keyed to the main shaft B is awinding drum 0, upon which are wound a hoisting cable C attached to anelevator car and a second, or safety, cable 0 The main shaft l3 projectsat each end beyond the framework, and upon one end a belt pulley D turnsloosely provided with a long hub D, to the end of which is keyed apinion D D is a belt pulley D and turning upon the shaft B is a beltpulley D held in place by a collar D, the pulleys D and D forming loosepulleys driven in opposite directions by Turning loosely upon the hub"open and crossed belts and from which the belts are alternately shiftedto the central driving pulley D by the shipping mechanism hereinafterdescribed. The pinion D ongages a gear D upon a shaft D journaled on theframe-work A, A and carrying a pinion D engaging the gear D turningloosely upon the main shaft B. of the drum 0 and gear D are providedwith the annular concentric flanges E and E The flange E is providedexternally with the segmental ribs 13 ,12 and the flange E is providedinternally with similar segmental ribs E E The inner sides of the ribsF. and E are inclined as shown at a and 1), Figs. 6 and 8, forming camsurfaces so thatby entering the flange E Within the flange E androtating the gear D", so as to bring the ribs E behind the ribs E theinclined cam surface a, b, willcause the gear D to be drawn toward thedrum 0.,

Placed upon the flange E is a ring E whose thickness is slightly morethan the length of the flangeE and having upon its outer face a seriesof ratchet teeth E engaged by a retaining pawl E held in the frame-workof the machine and limiting the rotation of the ring E to a directioncorresponding to that of the winding drum 0 as the hoisting cable isbeing wound upon it.

In the operat-ionof raising the load, rotary motion is imparted to thegear D in the direction of the arrow 1, Fig. 2, through the central beltpulley D and intermediate connecting mechanism, causing the inclined orcam surfaces a, b of the segmental ribs E F. to be rotated upon eachother, drawing the gear D toward the drum C and clamping the ringbetween their opposing surfaces causing the drum 0 to be rotated in thesame direction as the driving gear D", and winding up the cables O and 0the ratchet teeth F. slipping beneath the spring actuated pawl E Vhenthe load is to belowered the gear wheel D" is rotated in the directionof the arrow 2, Fig. 2, and the ring is held from turning by theretaining pawl E if the gear D moves in advance of the drum 0 in thedirection of the arrows 2 the inclined surfaces at, l) are moveduponeach other to that extent, thereby reducing the friction of the drum 0against the side of the ring Ff, sufficiently to allow the The opposingsides.

load to turn the druu'rand unwind the hoisting cable; in case, the drum0 should turn in the direction of the arrow 2 in advance of the gear D",the action of the inclined surface a, I) would again act to clamp thering E between the drum 0 and gearD, thereby checkmg the rotation of thedrum 0 as the ring E is held from turning by the pawl E. No movement,therefore, of the drum 0 in the direction of the arrow 2, Fig. 2, cantake place 1n advance of the rotation of the gear D". If the rotation ofthe gear D should cease through the failure of the operating mechanismthe drum 0 would instantly become drawn against the fixed ring E and thedescending motion of the load checked.

Theoppositely running belts, carried upon the loose pulleys D and D arealternately shifted upon the central driving pulley D by means of theshipping mechanism consisting of'the sliding bars F and F carrying attheir ends belt eyes F2, F and sliding in suitable ways provided in theframe-work of the machine; the opposite ends of the bars F, F'areprovided with slots F, that in the bar Fbeing shown by broken lines Fig.1, by which they inclose averticalshaft G journaled in bearings G at theend of the machine opposite the belt pulleys. The Vertical shaft Gcarries at its lower end a cam plate G provided on its upper side withacam groove G the inner half of the cam groove being helical and theouter half concentricwith the cam plate G The slidlngshipping bar F"carries a stud F with a cam roll thereon, entering the cam groove Gwhereby a sliding movement will be imparted to-the shipping bar F' by'the rotation of the cam G which causes the stud F -to traverse thehelical section of the cam groove G and holding the shipping bar frommovement while the'stud F traverses the concentric section of the camgroove G Near the upper end of the verticalshaft G is placed a cam plateHhavinga similar cam groove H, denoted by the broken lines in Fig. 1,but havingthe helical and concentric sections of'the cam groove sodisposed that their action will be the reverse of the cam groove Gcausing the shipping bar F to be moved during the period of rest of theshipping bar F and held at rest during the movement of the bar F. A studH inthe bar F carries a cam roll entering the groove I-I'.

A reciprocating rotary motion is imparted to the shaft G by means of thedrum I attached to its upper end and a shipping cord 1 wound around thedrum and carried through the elevator car in the usual manner.

In the drawings the vertical shaft G and its attached cams and connectedshipping bars are shown in that position in which the driving beltswould-be held upon the loose pulleys D? and D driving them in thedirection of v the arrows 3 and 4:, Fig. 1.' If the vertical shaft G andits attached cams G and H be turned around half a revolution in thedirection of the arrow 5, Fig. 1, the shipping bar moved along its waysshifting the driving belt from the pulley-D to the driving pulley D,causing the gear D to be turned in the direction of the arrow 2, Fig. 2,unwinding the hoisting cable from the drum 0 and allowing the load todescend. By reversing the motion of the vertical shaft G, one half arevolution, the shipping bar F will be returned to the position shown inFig. 1, carrying the driving belt from the central pulley D to the loosepulley D and stopping the motion of the hoisting mechanism; thecontinued rotation of the vertical shaft G in the direction of the arrow6 will slide the shipping bar F, and

move the driving belt from the loose pulley D to the central pulley D,causing the gear D to be driven in the direction indicated by the arrow1 Fig. 2, and winding the hoisting cable uponthe drum 0.

Whenever the hoisting mechanism is in operation, either in winding orunwinding .the hoisting cable, the driving belt by which'motion isimparted to the gear D is automatically shifted from the driving pulleyDto the appropriate loose pulley by meansof the following mechanism: Theend-of the-shaft 13 projects beyond the frame-work A, A upon the sideopposite the belt pulleys, and'the projecting end is provided withascrew thread J; turning loosely'upon the screw threaded section of theshaft isa collar J and a pinion J 2 connected together by the-frame J Jprovided with guides J J the whole being held upon the shaft by thefixed collar J Midway between thecollar J andthepinion J is placed a nutJ 6 provided with arms J embracing the ways "J J by which the nut J isheld from rotation andmade'to traverse along the screw threaded sectionJ. Clamped upon the screw threaded section J are the collars J J whichare adjustably fixed upon the shaft B in the desired position. Thecollars J and J are provided with the projecting spurs J J 'and the nut'J i-s'provided with similar-projecting spurs J J When theshaft B isrotated in the direction IIO of the arrow 1, Fig. 2, in the operationof,

winding the hoisting cable, the nut J is traversed along the shaft 13toward the framework until its projecting spurs engage ,the

projecting spur upon the fixed collar J ,when

the rotation of the shaft/B willbe communicated through the fixed collarJ and the engaged nut J to the frame J and pinion J causing the pinion Jto rotate in the same direction as the shaft. The rotation of the pinionJ is communicated to a pinion K turning loosely upon the stud K held inthe frame-work of the machi'neand carrying upon its side a bevel pinionK engaginga bevel pinion K upon the-shaft G, causing theshaft G to berotated in the direction of the" arrow 5, Fig. 1; until the driving beltthen in action is carried upon its loose pulley, when the m0- tion ofthe hoisting mechanism will cease. If, however, the motion of the mainshaft B is in the direction of the arrow 2, Fig. 2, the nut J will bemade to traverse along the screw threaded section J, until itsprojecting spur engages the spur upon the fixed collar J causing thepinion J to be rotated in the opposite direction, reversing the motionof the vertical shaft G and shifting the driving belt upon itsappropriate loose pulley.

Pivoted to the frame-work are levers N, N, carrying at their free endsthe rod N upon which are placed the scored pulleys l N capable ofrotating upon and traversing along the rod N. These pulleys rest uponthe cables C, O and are moved along the rod N as the cables traversealong the drum 0. The weight of the levers N and rod N of rolls N aresupported upon the hoisting cables in the position represented in thedrawings.

Pivoted to one of the levers N is a vertical lever N capable of beingadjusted in its angular relation to the lever N by means of a pin Nentering holes in a blade N, or by any other obvious and known method ofadjustment. The upper end of the vertical lever N carries a guide pulleyN and is provided with an eye N the lever being offset at N to bring theguide pulley and eye in a plane tangential to the face of the upper camplate I'I.

A cord N is attached to the cam plate H and carried over the guidepulley N and through the eye U supporting the weight N the length of thecord N being such that when the vertical shaft G is turned in thedirection of the arrow 5, shifting the belt from the loose pulley D tothe driving pulley D and causing the drum 0 to be turned in thedirection of the arrow 2, Fig. 2, in the operation of unwinding thehoisting cable, the weight N will be brought against the under side ofthe eye N If during the operation of unwinding, the cables are broken orslackened allowing the lovers N, N to fall, the cord N will be drawn offthe cam plate II rotating the vertical shaft G in the direction of thearrow 6, Fig. 6, until the driving belt is shifted to its loose pulleyand the hoisting mechanism stopped.

In the construction shown by the accompanying drawings the drum isattached to the main shaft while the driving gear D turns loosely uponthe shaft. If preferred, however, the winding drum may turn upon theshaft and the gear D be keyed to the shaft. I have also shown an annularflange E upon the side of the winding drum entering within the annularflange E upon the side of the driving gear D"; the conditions might,however, be changed and the larger flange carrying the internal ribs canbe placed upon the side of the drum, inclosing an externally ribbedflange upon the side of the driving gear.

The entire operation of winding and un winding the hoisting cable iscarried on in dependentlyof the main shaft, which is thereby relieved ofthe end thrust or torsional strain incident to the operation of the machine, the only function performed by the rotation of the main shaftBbeing to actuate the nut J and connected mechanism by which the hoistingmechanism is stopped at each end of the travel of the load. By drawingthe gear and winding drum together by means of the cam shaped segmentalribs upon the flanges E and E the torsional strain is transferred tosurfaces of greater diameter than the driving shaft.

What I claim as my invention, and desire to secure by Letters Patent,is-- 1. In an elevator, the combination of a winding drum, an annularflange projecting from the end of said drum, a driving gear having itsaxis coincident with the axis of said drum, an annular flange projectingfrom the side of said driving gear, opposing the flanged end of saiddrum, said annular flanges overlapping each other and segmental camshaped ribs carried by said flanges, said ribs interlocking each other,by which said gear and said drum are drawn toward each other,substantially as described.

2. In an elevator, the combination of a winding drum, a driving gearhaving its axis (30- incident with the axis of said drum, interlockingannular flanges on the opposing sides of said gear and said drum, a ringinterposed between said gear and said drum and cam shaped external andinternal ribs on said flanges, whereby said gear and said drum are drawntogether against said annular ring and the motion of said gearcommunicated to said drum, substantially as described.

3. In an elevator, the combination of a winding drum, a driving gearhaving its axis coincident with the axis of said drum, interlockingflanges on the opposing sides of said gear and said drum, external andinternal cam shaped ribs on said flanges, whereby said gear and saiddrum are drawn together, a ring interposed between said gear and saiddrum and retaining mechanism by which said ring is held from rotation inone direction, sub stantially as described.

4. In an elevator, the combination of a wind ing drum, a driving gearhaving its axis coincident With the axis of said drum, interlockingflanges on the opposing sides of said gear and said drum, cam shapedribs on said flanges, by which said gear and said drum are drawntogether, a ring interposed between said gear and said drum, retainingmechanism by which said ring is held from turning in one direction, adriving pulley with its axis coincident with the axis of said drum, apinion carried upon the hub of said driving pulley, an intermediateshaft, a gear carried on said intermediate shaft and engaging said 7inion and a inion carried on said intermediate shaft and engaging saiddriving gear, substantially as described. I

5. In an elevator, the combination with a llO supporting frame-work, ofa shaft journaled in said frame-work, a driving pulley turning looselyon said shaft,a pinion attached to the hub of said driving pulley, adriving gear carried on said shaft, a winding drum carried on said shaftand operatively connected with said driving gear, an intermediate shaftcarrying gears engaging said pinion and said driving gear, whereby therotary motion .of said driving pulley is transmitted to said drivinggear and winding drum, and said shaft relieved from torsional strain,substantially as described.

6. In an elevator, the combination with a shaft, provided with ascrewthreaded section, a winding drum operatively connected with said shaft,and driving mechanism connected with said shaft, by which it may berotated in opposite directions, of a nut J carried upon the screwthreaded section of said shaft, a frame J 3 provided with ways J saidnut haviug arms engaging said ways, collars J S and J adjustably fixedon said shaft, spurs projecting from said collars and said nut andarranged to mutually engage each other, a pinion J attached to saidframe J, a shaft G, cam plates H and G carried by said shaft, shipperbars actuated by said cams, said pinion vJ and said shaft G, beingoperatively connected through intermediate mechanism, substantially asdescribed.

tently connected therewith, a stud held by the frame-work, a spur gear Kturning loosely on said stud and engaging said pinion J a bevel gearattached to said spur gear and engaging a bevel gear upon a shaft G, ashaft G, cams H and G carried by said shaft and shipping bars actuatedby said cams, substantially as described.

8. In an elevator, the combination of a shaft G, cams, carried by saidshaft, shipping bars actuated by said cams, a lever N pivoted at one endand having its free end supported by the tension of the hoisting cable,a lever N? pivoted upon said lever N, capable of angular adjustment'thereto, and a flexible connection between said lever N and saidshaft G, by which the release of said lever will cause the shaft G to berotated, substantially as described.

Dated at 'Worcester, in the county of Worcester and State ofMassachusetts, this 19th day of October, 1891.

JOHN A. DEAN.

Witnesses:

RUFUs B. FOWLER, H. W. FOWLER.

